On Sun, 26 Jul 2020 17:49:07 +1000 Geoffrey McRae <[email protected]> wrote:
> Hi All, > > The commit 22540ca3d00d2990a4148a13b92209c3dc5422db causes a Windows KVM > guest running under QEMU with a VFIO passthrough GPU to randomly stall > when using the GPU leading to the guest assuming that the driver has > hung. Reverting this commit resolves the problem. Please double check this commit ID, I can't find it in mainline or linux-next. Thanks, Alex > The host system is configured with the following kernel arguments which > may be related: > isolcpus=0-5,24-29,6-11,30-35 rcu_nocbs=0-5,24-29,6-11,30-35 > > The system is an AMD Threadripper 2970WX on a Gigabyte x399 AORUS Gaming > 7 board. > It has two GPUs each being passed through to two separate KVM guests, > one is an AMD Radeon 7 in a Linux guest, the other is a GeForce 1080Ti > in a Windows guest. > The cores used for these two guests are isolated from the host for > performance reasons. > > Any insight as to why this is occurring would be appreciated. If you > need any more information or would like to test patches please let me > know. > > Kind Regards, > Geoffrey McRae > HostFission > > https://hostfission.com >
